Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Recreational Artifacts (hierarchy name)
5. recreational artifacts (equipment)
6. toys (recreational artifacts)
7. [toys by form]
8. optical toys

Anotations

Scope note:

Toys in which two or more mirrors at one end of a tube create, when rotated, ever-changing symmetrical patterns by reflecting bits of glass or metal contained within the tubes or other objects sighted outside the tube.